# -*- coding: utf-8 -*-
"""
Created on Mon Sep  6 17:14:45 2021

@author: 刘长奇-2019300677
"""
import random
alpha=26*['']
print(len(alpha))
for i in range(65,91):
    h=i-65
    alpha[h]=chr(i)
   
    
    
#产生大写字母
num=['']*10
for j in range(10):
        num[j]=str(j)
#产生数字
low=['']*26
for k in range(26):
    low[k]=alpha[k].lower()
#产生小写字母
def rand(lst):
    a=random.choice(lst)
    return a
#产生列表内随机元素
for i in range(200):
    print(rand(alpha)+rand(alpha)+rand(num)+rand(num)+rand(num)+rand(low)+rand(low)+rand(low)+rand(alpha)+rand(low)+rand(alpha))

